Everything prostrates unto Allah

Allah affirms His might and power, for He has full control over everything, and everything is subservient to Him. Therefore, everything, including the believers, prostrate to Allah willingly, while the disbelievers do so unwillingly,

وَظِلَـلُهُم بِالْغُدُوِّ

In the next verse (13), it was said: وَيُسَبِّحُ الرَّ‌عْدُ بِحَمْدِهِ وَالْمَلَائِكَةُ مِنْ خِيفَتِهِ (And the thunder proclaims His purity with His praise, and [ so do ] the angels, out of His awe). In Arabic usage, the word: الرَّ‌عْدُ (Ar-Ra` d)refers to the sound of the clouds generated by their collision. The sense of (Tasbih: the glorification of Allah) mentioned here is that of the same Tasbih about which it has been said in another verse of the Qur’ an: وَإِن مِّن شَيْءٍ إِلَّا يُسَبِّحُ بِحَمْدِهِ وَلَـٰكِن لَّا تَفْقَهُونَ تَسْبِيحَهُمْ 'And there is nothing in the heavens and the earth which does not glorify Allah, but they do not understand their glorification' - (17:44).

And it appears in some narrations of Hadith that Ar-Ra'd is the name of the angel appointed to bring rains. In terms of this sense, the reciting of Tasbih is obvious.